Safety device for stamping presses and the like



Aug. 1940- E. SANDEL 2.210.181

S'AFETY DEVICE FOR STAMPING PRESSES AND THE LIKE Filed March 18, 1940 2Sheets-Sheet l m r: (I) 1! U3 I IN VENTOR.

ATTORNEY.

Aug. 6, 1940.

SAFETY DEVICE FOR STAMPING PRESSES AND THE LIKE Filed March 18, 1940 2Sheets-Sheet INVENTOR.

BY 5/722? 6a/zda i v/ ATTORNEY.

E. SANDEL- 2.210.181

Patented Aug. 6, 1940 FlCE.

PTN

SAFETY DEVICE FOR ST'AIVIPING PRESSES AND THE LIKE Emil Sande], St.Louis, Mo. Application March 18, 1940, Serial No. 324,514

6 Claims.

.My invention relates to a safety device for stamping presses and thelike.

The object of my invention is to provide a press with an upwardlymovable roller arm guard carrying a curtain shield unwindable from theroller arm guard to automatically prevent exposure of the hands of theoperator to the dies, or other movable parts above the operators tableof the press, as well as the body of the operator from injury by brokenparts thrown forwardly from the press.

A further object of the invention is to control the upward movement ofthe safety device directly from the crank-shaft of the press' upondownward movement of the plunger, or crosshead thereof.

A further object of the invention is the provision of, means forautomatically rewinding the curtain shield instantly upon the ascendingmovement and for the return of the roller arm guard to normalnon-protective position.

A still further object of the invention is to provide a safety devicefor presses which is simple and comparatively inexpensive inconstruction, and highly efficient in operation.

With the aboveand other Objects in view, the invention consists in thenovel features of construction, arrangement and combination of partshereinafter more fully described and finally pointed out in the claimshereto appended.

Referring to the accompanying drawings:

Fig. l is a side elevation of a press equipped with a safety deviceembodying the features of my invention.

Fig. 2 is a front elevation of a press provided with my safety device.

Fig. 3 is a top plan view of a press provided with my safety device. IFig. 4 is a detail of the. roller arm guard with the curtain shieldsecured thereto.

Fig. 5 is a view showing the lever arms an curtain roller guardsupported in its extreme elevated position.

In the drawings, I have illustrated a press designated,' generally as A,and which includes the side frame members I and l, the operators table2, the crank-shaft 3 and the plunger, or cross-head 4 controlled by thecrank-shaft .3 for imparting reciprocating motion thereto.

In carrying out the invention, I employ a pair of lever arms designated5 and 5. The arms 5 and 5' are pivotally connected at their rear ends tothe side frames 1 and l' of the press, as at 6 and 6, respectively. Thearms 5 and 5 project forwardly and downwardly from the pivotsfi and 6,respectively,pto a point slightly in advance of the forward edge of theoperators table 2.

A suitable wheel 1 is suitably secured to one end of the crank-shaft 3to rotate therewith. A suitable connecting rod 8 is pivotedeccentrically,

as at 9, at its upper end to the wheel I and the lower end thereof isshown as passing through a. suitable eye-bolt, or equivalent member ll),which eye-bolt is pivotally secured to and projects laterally from theoutside face of the lever arm 5 intermediate the ends thereof. The lowerend of the connecting rod 8 is screw-threaded, as at H, and is providedwith one or more nuts IE to serve as a stop to limit downward movementof the lever arm 5. The nuts l2 are disposed below the eye-bolt I so asto engage the lower face thereof for raising the lever arm during upwardmovement of the connecting rod 8 during one-half revolution of the wheel1 on the crank-shaft 3.

A suitable guide and supporting rod I3 is pivotally connected at itslower'end, as at I4, to the lever arm 5 and projects upwardly therefrom.The upper end of the rodv l3 passes upwardly through a suitableeye-bolt,or equivalent member l5, which is suitably secured to and projectsforwardly from the side frame member I. The upper end of the rod I4 isscrew-threaded, as at It, and is provided with one or more nuts I!acting as stop members to limit downward move-.

ment of the lever arm 5. During upward movement of the lever arm 531m:rod [3 moves freely upwardly through the eye-bolt l5 which serves as aguide for the rod I3.

A suitable roller "I8 is disposed between the 1.

forward ends of the lever arms 5 and 5. The roller [8 is rotatablysupported upon a shaft l9 which passes longitudinally and axiallythrough the roller l8. The ends of. the shaft l9 pass through openingsinthe free ends of the lever arms 5 and 5' and are supported thereby.The shaft lficonnects the lever arms 5 and 5' at their forward ends andis stationary relative thereto. The ends of the shaft 119 arescrew-threaded and carry inner and outer nuts 20 andZll' to keep thelever arms 5 and 5 from spreading apart at their forward ends and tolock the shaft against rotation. The roller is. provided at one end withan enlarged bore 2! to house a suitable coiled spring 22. The spring 22is suitably anchored at one end to the shaft I9, as at [9, and at itsopposite end it is suitably anchored to the roller. 83, as at B8.

A suitable flexible guard curtain, or shield 23 issuitably secured atits upper edge to the roller l8 and is normally wound a number of timesaround the roller. The lower edge of the curtain, or shield 23, whichcan be of suitable heavy fabric, leather or other suitable flexiblematerial, is provided with a metal, or equivalent, reinforcement 2%having aplurality of openings 25 therein. A plurality of suitable hooks26, or equivalent devices, are secured to the front face of the pressadjacent and below the operators table 2. The hooks 26 are adapted topass through the openings 25 in the lower edge of the curtain, or shield23 for detachably securing the lower edge thereof to the press.

Operation When the arm guard roller I8 is in its lowermost, or normalposition, the plunger or crosshead 4 of the press is in its uppermostposition. When the cross-head 4 starts to descend, the wheel 1 rotateswith the crank-shaft 3. Instantly, upon upward movement of theconnecting rod, which is eccentrically connected to the wheel 1, theroller I8 is raised in an arcuate path due to upward movement of thefree ends of the lever arms 5 and 5'. The wheel 1 turns but one-halfrevolution during descending movement of the cross-head 4 and duringthis movement, the roller 18 has raised progressively to its uppermostposition, as shown in dotted lines designated, generally as B in Fig. 1,withthe descending movement of the cross-head 4 and stretched thecurtain or shield 23 between the elevated roller [8 and the front of theoperators table 2 of the press. During the initial descending movementof the cross-head 4 and the ascending movement of the roller IS, theoperator's arm will be struck by the curtain on the roller and shouldhis hand be exposed to the dies, the raising rotating roller l8 willcause the operators arm to be rolled away from the dies and at the sametime elevated withdrawing his hand from danger.

At the same time that the roller is being raised and the curtain, orshield unwound therefrom, thecoiled spring 22 is being wound up, andinstantly upon ascending movement of the crosshead 4, the coiled spring22 will rewind the curtain on the roller l8 and pull the leverarms 5 and5' downwardly to normal position, as shown in full lines in Fig. 1.

When it is desired to support the lever arms 5 and 5' and the rollercurtain guard or shield in an extreme elevated position such, forinstance, as when positioning dies, repairs, or for other reasons, thecurtain or shield 23 is unhooked at its lower edge from the hooks 26 andthe lever arms 5 and 5, including the roller l8 with the curtain areraised to extreme upward position. When thus raised, a pin 21 can bepositioned in an opening 13' in the guide and supporting rod I3 belowthe lever arm 5 to hold the same in its elevated position, as shown inFig. 5, and the free edge of the curtain 23 can be attached to a hook 28carried by the press frame to hold the free edge of the curtain in anelevated position.

The many advantages of the herein described invention will readilysuggest themselves to those skilled in the art to which it appertains.

From the foregoing description, it is evident that a simple device forthis purpose has been disclosed, but it is to be understood that I donot desirev to restrict, or limit myself to the very details of theconstruction shown and described, which is merely illustrative, it beingobvious that changes, not involving the exercise of invention, may bemade without conflicting or departing from the spirit of the inventionwithin the scope of the appended claims.

What I claim is: a

1. In a stamping press or the like having a frame structure and anelevated crank-shaft supported thereby, the combination therewith oflever arms pivoted to and projecting forwardly from the frame member, awheel secured to one end of the crank-shaft, a rod eccentricallyconnected at its upper end to the wheel, a member having an openingtherein secured to one of the lever arms, said rod passing through saidopening and provided with a stop member below the opening, a shaftconnecting the free ends of the lever arms and secured against rotation,a roller mounted on the shaft, a coiled spring encircling the shaftwithin the roller, said spring being secured at one end to the shaft andat its opposite end to the roller, and a flexible curtain guard securedat one edge to the roller and detachably connected at its opposite edgeto the frame structure.

2. A device as defined in claim 1,,including an apertured guide membersecured to the frame structure, a rod like member pivoted at its lowerend to the other of said lever arms, said rod like member passingupwardly through the apertured guide member, and a stop member carriedby the rod like member above the apertured guide member.

3. In a machine having a frame structure and an elevated crank-shaft,the combination therewith of a lever arm supported roller guard curtaindisposed normally in a lowered position in advance of the framestructure, the lower free edge of the guard curtain being detachablyconnected withthe frame structure, and means actuated by rotation ofone-half revolution of the crank-shaft to unwind and stretch the'leverarm supported roller guard curtain upwardly to establish a curtain wallin front of the frame structure, and resilient means for automaticallyrewinding the guard curtain instantly upon starting of the halfrevolution of the crank-shaft to lower the curtain Wall.

.4. A device as defined in claim 3, including means for holding thelever arm supported roller guardcurtain in an elevated position inadvance of the frame structure after the lower edge of the guard curtainis detached from its connection with the frame structure, and means forreattaching the free edge of the guard curtain in an elevated positionto the frame structure.

5. In a machine having a frame structure and an elevated crank-shaft foractuating reciprocal means, the combination therewith of an eccentricdisc secured to the crank-shaft, pivoted lever arms projecting forwardlyand downwardly from the sides of the frame structure, a roller guardcurtain carried by the free forward ends of the lever arms, said curtainbeing detachably secured at its lower free edge to the frame structurebelow the forward free ends of the lever arms, means for suitablyconnecting one of the lever arms with the eccentric disc for raising thelever arms to unwind and stretch the guard upwardly during one-halfrevolution of the crank-shaft, and resilient means for rewinding theroller guard curtain and lowering the lever arms instantly upon startingof the other half revolution of the crankshaft.

6. A device as defined in claim 5, including means to limit downwardmovement of both lever arms, and means for holding the lever arms andguard curtain in an elevated position after the lower edge of the guardcurtain has been detached from connection with the frame structure belowthe lowermost position of the lever arms.

EMIL SANDEL.

